Device for the generation of pressure in presses



June 19, 1945. F; FRICK 2,378,764

DEVICE FOR THE GENERATION OF PRESSURE IN PRESSES Filgd May 7, 1941 2 Sheets-Sheet 1' 7c Z fl/ Ze 4 i /3a 4 Z E I T 5 Y j Z5- 0 g y u. s II.IIII

f IIIHH." AHH IN V EN] OR.

M ATTORNEY R. FRICK June 19, 1-945.

DEVICE FOR THE GENERATION OF PRESSURE IN PRESSES Filed May 7, 1941 2 Sheets-Sheet 2 ,lr'zvmfor R ein/wld Fric/b.

. Patented June 19 1945 DEVICE FOR THE GENERATION F PRESSURE IN PRESSES Reinhold Frick, Heidenheim-on-the-Brenz, Germany, assignor to American Voith Contact 00. i 3 Inc.,: New York, N. Y., a corporation of New York Application May 7, 1941, Serial No. 392,339 r In Germany February 19, 1940 l 3 Claims.

This invention relates to a device for the generation of pressure in presses, especially in roller presses for paper and. cellulose dewatering machines, the pressure of which is generated by means of a system of levers. V

It is a well known practic'eto use weighted levers for the generation of pressure in roller presses. The increasing width and the increasing dewatering effect of these presses needed the application of ever increasing pressures.

. to-any degree to make it actually possible to generate with a lever, not surpassing the length of the press in longitudinal direction of the dewatering machine, the high pressures for wide I First of all it hasbeen tried to attain this by r011 pre w h a hi h dew terin eff c increasing the weights and by lengthening the The invention is shown in the drawings exweighted arm of lever. But soon a limit was p nin t e two rra gements of the journals reached, the transgression of which was followed according to invention. In the drawings, by considerable disadvantages. The increase Fig. l is a e i n p an view showing on of the weights decreased the sensitiveness of the form of my improved pres re p yin v e, whole arrangement by the increasing inertia, said view being taken along the lines I| in making it hard to respond to variations of thickness of the layers or to the entrance of foreign Fig. 2 is a sectional plan view of another form matter at the nip. The lengthening of the leof my pressure applying device; vers exceeding a certain limithad the disadvan- Fig. 3 is a side elevation of a portion of a press tage that-the leverof the press reached far over with my improved pressure app y n System the space allotted to the press, limiting thus sociated therewith; the accessibility of other parts of the machine Fig. 4 is a vertical sectional detail view of the especially of an additional press in the neighlower left-hand portion of Fig. 3, said view bebourhood. Therefore it has been tried before ing taken along the line 44 in Fig. 1. to limit the length of the load lever to the length The two fixed lever bearings or tines la and of a press by using a double lever. This device lb are integral with the press frame fork I, and increased the pressur suficiently and kept the in these bearings the ball or roller bearings Ic lever moderately short but had the disadvanand Id respectively are mounted. The forked tage of a bigger number of bearings which are lever 2 with its journals 2a and 2b is carried in generallydesigned as iulcrums for such levers. these bearings. The journals 2c and 2d,. excen- These bearings are easily dirtied by fibers durt a ly ar a ed to the journals a and 2b reing the run of a cellulose dewatering machine spectively, are inserted in the ball bearings 3a and wear quickly. In any case, practice has and 3b of the press part 3 to be moved. 3c is shown that each increase of the number of such a threaded ope f the press rod 4. The bearing points in the rod system of presses is member formed of the Journals 20 n undesirable, i the intermediate connected part 2c is made of The present invention eliminates these disn p e a inserted n the tine of lover advantages by shortening n r of a pressaid part being secured against turning by the sure lever even with highly stressed bearings angular form of the centre part or by special and correspondingly'high pressures, instead of screws 2g. This form of construction makes lengthening one of the arms of lever. The it possible to change the ratio of the lever in present lever hasone end thereof pivotally conthe simplest way by replacingonly one piece. nected-to a fixed bearing and the intermediate Figure 2 shows another arran ment f h portion of this lever is pivotally connected to jo n s. n which one Journal 411 is rigidly the part of-thepress to be moved. According cured in a boss or tine le of the press frame to the invention, the two pivots comprise two fork I, a j a having i projeot n d journalsarranged in the lever excentrically and mo ted a l bearing ar a ed i t facing each other, one of which is engaged with lever 2. A second journal 2g is rigidly secured the fixed bearing and the other with the movin the lever itself,said second journal having able press part. An alternate design of the the projecting end thereof mounted in a ball device consists in rigidly securing one of the bearing 3d of the press part 3 to be moved. ends of a pair of journals in the fixed bearing Both forms of the inventionare adaptedto and rotatably securing the other of the ends in be operatively associated with a conventional roller press, such as shown in Fig. 3. It is here seen that thepress frame fork l is fixed secured to a press frame l0, which frame rotatably supports a lower press roller IS. A second bracket II is mounted upon the press frame I0, which bracket pivotally supports as at l3 the intermediate end of a lever I2. One end of'lever I2 supports a second press roller I5 and the other end is-pivotally connected to the upper end of press rod 4.

I claim: l

l.'In a device for the generation of pressure in roller presses of paper and cellulose dewatering machines, the combination of a .framework, a stationary fork on said framework, a second forkextending laterally from said first fork, the tinesof one fork intermeshing with the tines of the other, means including a pin for pivotally connecting each of the tines of the second'fork respectively to an adjacent tine of the stationary fork, said connecting pivot pins being axially alined one with "another, a vertically movable-pressure applying link having one end thereof operativelyconnected to said roller press, "means-including a second pin for pivotally connecting the other end of said link to the tines of said second fork, said connecting second pivot pins being aligned one with another along an axis eccentric of and parallel to said axis of the first pins, the circumferential projection of said first pins upon a plane normal to said parallel axes intersecting with the circumferential projection of said second pins uponsaid plane whereby a short lever arm is obtained, and a weight on the laterally extending end of said second fork whereby the pressure applying link '10 is actuated by said weighted second fork.

2. A pressure applying device according to claim 1- wherein each tine of said second fork has said first and second pivot pins rigidly connected' thereto and projecting respectively from 15 opposite faces of the second fork tine, said first and second pins being rotatably mounted respectively inone'of said stationary fork tines and in said pressure applying link.

3. A pressure applying device according to 20 claim 1 wherein each tine of said second fork 25 named second fork tine and rotatably mounted in said pressure applying link.

- REINHOLD FRICK. 

